<!DOCTYPE html>
<html>
<body>
    <table border='1'>
        <tr><td>row 1</td></tr>
        <tr><td>row 2</td></tr>
        <tr><td>row 3</td></tr>
        <tr><td>row 4</td></tr>
        <tr><td>row 5</td></tr>
    </table>
    <button id="btnHideOddRows">Hide Odd Rows</button>
    <script src="hideoddrows.js"></script>
</body>
</html>
